Yes, she can. All female animals with a vagina can get an irritation in their vulva (vaginitis).
See a vet if you are worried your dog may have this.
Because She is sick or has arthritis. Take her to the vet.
Below there stomach.
The normal dog's vulva should be the same pigment as her skin (not necessarily her hair) on the external parts and a light pink to deep red on the internal parts depending upon whether she is in heat or not.
These are one of the cues that indicate a dog is in heat.
no
possibly
Any dog can get a bladder infection, although it is more common in female dogs.
Urinary tract infection, go to the vet
Dogs clean their private parts because it's actually like giving themselves a bath, and it's a lot easier for them.
This may be a infection. Make a Vet appointment.
You check if it has boy body parts or female body parts ☺
Exactly like males but with different 'parts' >_>